ONCE YOU UPDATE TO 4.3, YOU GET A SHINY NEW BOOTLOADER (that has the KNOX crap), and you CAN NOT GO BACK to the older bootloader. IF YOU FLASH THIS ZIP (AFTER TAKING THE 4.3 OTA), YOU ARE STUCK with KNOX, 4.3, and being unrooted.

Note II Video Here: http://bit.ly/14BcfmH

Download the zip here: http://bit.ly/S3Stock

(That's for the Sprint variant only!)

AT&T, Rogers, Telus, Bell: http://bit.ly/13GjUDo

This zip will reset your flash counter to 0, and put your Sprint Samsung Galaxy S3 (III) back 100% Stock Android 4.1.2 Jelly Bean (MD4 - Which is the latest as of this video!).